This is one of a very few examples of a bridge actually doing something! Good planning to be there at the right time. Good execution given what looks like an overcast day.
If you focus is on the rust, you might try some means of focusing our attention on it. For me, the yellow train sticks out more. The whole is a bit out of focus, and the lighting is uninteresting.
I don't know if I'd want to be down there with those 3 engine rumbling over top of me. Great photograph. Just look at the rust on those two bridge spans! Even the trestle part of the bridge looks uncared for. Like the way you've captured the yellow and black of the Engines, even the red lines of the engine 2199 and it's Red Numbers. Nice focus, good and crisp, sharp. Can we talk about Noise? I imagine there was lots of it with those 3 engines passing by! ! Congratulations on a good shot!
I like the composition, but the sky higlight blow-out takes the strength away. Possibly due to photographing (almost) straight into the sun's direction? The little lens flare suggests that.
Good potential.